Silencer construction



ys, 1941. I =`.E.DEREMER 2,241,768

S ILENCER CONSTRUCTION Filed Nov. 3, 1939 Patented May 13, 1941 UNITEDSTATES PTENT 2241562; SILENCER CONSTRUCTION Floyd E. Del-emer, Detroit,Mich. Application November 3, 193 9, Serial No. %2,773

(o. lal-61) 4 Claims.

This application relates to exhaust gas silencers, particularly forautomobila engines, and more particularly relates to the problem ofdraining of condensed moisture from within the silencer.

It is now the practice to provide in silencers a drain hole in theshell. Commonly the dran holes are formed by drilling holes into theshell from the outside of the shell after the assembly of the silencer.For several reasons this prac tice is objectionable. When a shell is ofmulti-ply Construction, the pressure of the drill in many instancescauses separation of the plies. In the use of the silencer, the drainingcondensate is blown inwardly by the rush of air into and around theinterior of the silencer, and thus forms a rust streak around thesilencer at the hole.

The object of the invention is to provide a novel drain holeconstruction particularly adapted for multiply shell silencers.

The invention is shown as embodied in a silencer shown in the appendeddrawing. In this draw- Figure 1 is a cutaway elevation drawing of amultiply silencer having a drain hole of the invention;

Figure 2 is an enlarged fragmentary longitudinal view of the drain holeper se;

Figure 3 is a cutaway end view.

The silencer herein shown consists of a shell of two plies o and I Isurrounding a through passage tube |2 having inlet and outletends I4-l5near the headers which close the shell and through which the tubepasses.

Near the outlet end of the silencer is the drain hole Construction ISwhich consists of two nested annular flanges projecting outwardly fromthe shell these being formed by piercing a hole through both pliessimultaneously when they are nested and before; the end headers areassembled with respect to the shell.

By forming the holes from the inside, there is no tendency to causeseparation of the plies. The outwardly projecting annular fianges form asump around the drain hole to insure proper drainage and to preventdrainage from being blown back into the silencer.

The interlocking annular flanges also operate to prevent relativerotation and longitudinal shifting of the plies, and this isparticularly useful during the assembly of the headers with respect tothe shell.

Now having described the drain hole Construction herein described,reference* should be had to the claims which follow for a determinationof the invention.

I claim:

1. An automobila exhaust gas silencer outer shell'consisting of twotelescoped plies having alir'ed holes, the inner ply having an outwardlyprojecting annular flange surrounding the hole therein and disposedwithin the hole of the outer ply.

2. An automobile exhaust gas silencer outer shell consis ting of twotelescoped plies having alined holes, the inner ply having an outwardlyprojecting annular flange surrounding the hole therein and disposedwithin the hole of the outer ply, the latter having an outwardlyprojecting annular flange surrounding the hole therein and alsosurrounding the annular flange surrounding the hole of the inner ply.

3. An automobile exhaust gas silencer outer shell consisting of twotelescoped plies having alined holes, the inner ply having an outwardlyprojecting annular flange surrounding the hole therein and disposedwithin the hole of the outer ply, the flange engaging the edge of thehole of the outer ply.

4. An automobile exhaust gas silencer outer shell consisting of twotelescoped plies having alined holes, the inner ply having an outwardlyprojecting annular flange surrounding the hole therein and disposedwithin the hole of the outer ply," the latter having an outwardlyprojecting annular flange surrounding the hole 'therein and alsosurrounding the annular flange surrounding the hole of the inner ply,the flanges engaging each other. i

FLOYD E. DEREMER.

